Dusk comes to an end and night slowly falls.
As soon as Yun Cong'an came back from outside, he was called to a room for a meeting. The participants included Zhenbei Hou, Yan Cheng, Leng Yan and the four brothers of the Yun family.
After discussion, they believed that the person who sent the secret letter to the Hu people must be in the Northwest Army.
Only the Northwest Army itself would know the movements within their army and reveal them to the Hu people.
They first focused their attention on the secret letter found on the Hu people.
In a room where the news would definitely not be leaked, several people sat together.
The secret letter was placed on the table, and the faint candlelight flickered, illuminating their serious and focused faces.
They carefully analyzed the handwriting on the secret letter, not missing any strokes that might reveal clues.
Yan Cheng seemed to be lost in thought, his fingers lightly touching the ink on the paper, his voice light and airy.
"The handwriting seems ordinary, but it reveals a deliberate disguise, as if the writer is trying hard to hide his or her true handwriting."
Yun Cong'an leaned in to observe carefully, then nodded in agreement, "Not bad, and the flow of the strokes seems to have some unique characteristics."
The Marquis of Zhenbei pondered for a moment, then took the secret letter in his hand and said, "Perhaps we can find similarities between this habit and the writing habits of military generals."
They then studied the paper used. The paper had a special texture, fine grain, and a fresh fragrance, and it was sold at a very high price on the market.
Zhenbei Hou stroked the surface of the paper with his fingers.
"This kind of paper is not ordinary. There must not be many people in the army who can use it. I guess the person who passed this secret letter was not an ordinary soldier."
Yun Rongji, the second son of Yun Cong'an, said, "That must be the general."
The third son, Yun Ronghuan, said, "We need to start with the papers the generals use daily and check them one by one."
The Marquis of Zhenbei nodded in agreement. "This is an important direction. We cannot let go of any clues. We must find this hidden thorn in the Northwest Army."
In the following days, they acted independently to investigate the daily whereabouts and interpersonal interactions of military generals.
Yan Cheng took Leng Yan and traveled between various camps in the name of inspecting military affairs, using the identity of Prince Yong.
Even though the soldiers in the army were all muttering that as a prince he had no idea how to lead troops in battle and that he was probably joking, it didn't stop the generals from nervously standing up to greet him every time he entered a tent.
At this time, Yan Cheng would usually talk to them while observing their expressions and reactions calmly.
If someone avoids looking at him or has an unnatural expression, Yan Cheng will be more cautious.
Once, during an inspection, Yan Cheng mentioned that the Hu people seemed to be very clear about the movements of their Northwest Army recently, and they always managed to escape before they arrived. It seemed that something was wrong.
The next moment, he and Leng Yan both noticed that a general was evasive in his answers and beads of sweat appeared on his forehead.
Yan Cheng was suspicious, but he remained calm on the surface. He simply said, "Prepare for the battle well and don't let anything go wrong."
After leaving the tent, Yan Cheng put this person on the key observation list.
Yun Cong'an brought his son and nephew to mingle among the soldiers, became friends with them, and obtained various information from them.
The Marquis of Zhenbei used the prestige and extensive network of contacts he had accumulated in the army over the years to obtain various pieces of information from some of his old subordinates.
Those old subordinates were loyal to the Marquis of Zhenbei and had fought against the Hu people for many years. They hated the Hu people so much and would never help them.
Hearing that the Marquis of Zhenbei wanted information, they all told him what they knew.
Some said they had seen a certain general having a secret conversation with a stranger outside the tent, some said that a certain general had been behaving abnormally recently and often sat alone in a daze, and still others said that a certain general was always trying to find out all kinds of news.
The Marquis of Zhenbei collected these fragmentary pieces of information one by one and compared them with the information collected by Yan Cheng and others.
After some twists and turns, they combined clues from all sides and targeted several generals who behaved suspiciously on a daily basis.
However, in order to catch the traitor without alerting the enemy, several people discussed and carefully designed a trap.
They deliberately released false information, claiming that they were going to launch a large-scale raid on the Hu people.
This information was inadvertently spread in the army, becoming more and more widespread, until almost everyone had heard of it. During this period, Yan Cheng and others closely observed the actions of those suspicious generals.
As expected, the traitor fell into the trap and couldn't wait to pass the information to the Hu people.
When the Hu people took action, the Marquis of Zhenbei had already asked Yan Cheng to lead his troops to wait in a hidden place, and Leng Yan still accompanied him like a shadow.
When the Hu people excitedly acted according to the false intelligence, they found themselves falling into a trap carefully set by Yan Cheng.
The Hu people were caught off guard. Yan Cheng successfully captured all of them. When he brought them back to the army, the Marquis of Zhenbei had already found out the traitor in the army.
However, when Yan Cheng was about to take the Hu people to confront the traitor and find out the reason for the traitor's betrayal, the traitor died mysteriously in prison and the clue was interrupted again.
When Yan Cheng and others rushed to the prison, they saw the traitor's body lying coldly on the ground, with black blood hanging from the corner of his mouth, obviously he died of poisoning.
Yun Cong'an frowned and pounded the wall angrily: "Damn it, someone must be trying to silence me!"
Otherwise, how could it be such a coincidence?
They had just captured a group of Hu people and were about to confront the traitor, but the traitor, who had been afraid of death, committed suicide?
The Marquis of Zhenbei had a gloomy expression on his face: "There must be other traitors in this army, otherwise how could this happen by chance? Let's go out and look for them!"
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